linux-kernel - Re: [PATCH 1/1] rtc: pcf85063: fallback to parent of

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Message-ID: <20210522153636.ymyyq4vtzz2dq5k2@pengutronix.de>
Date:   Sat, 22 May 2021 17:36:36 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Francois Gervais <fgervais@...tech-controls.com>,
        linux-rtc@...r.kernel.org,
        Michael McCormick <michael.mccormick@...tel.net>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/1] rtc: pcf85063: fallback to parent of_node

Hello Greg,

On 17.04.2021 00:16:40, Alexandre Belloni wrote:
> On Wed, 10 Mar 2021 16:10:26 -0500, Francois Gervais wrote:
> > The rtc device node is always or at the very least can possibly be NULL.
> > 
> > Since v5.12-rc1-dontuse/3c9ea42802a1fbf7ef29660ff8c6e526c58114f6 this
> > will lead to a NULL pointer dereference.
> > 
> > To fix this we fallback to using the parent node which is the i2c client
> > node as set by devm_rtc_allocate_device().
> > 
> > [...]
> 
> Applied, thanks!
> 
> [1/1] rtc: pcf85063: fallback to parent of_node
>       commit: 03531606ef4cda25b629f500d1ffb6173b805c05
> 
> I made the fallback unconditionnal because this should have been that way from
> the beginning as you point out.

can you queue this for stable, as it causes a NULL Pointer deref with
(at least) v5.12.

Thanks,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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